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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org,
Carsten Emde <C.Emde@osadl.org>, Thomas Gleixner <tglx@linutronix.de>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: [PATCH 16/16] slub: Enable irqs for __GFP_WAIT
Date: Wed, 13 Feb 2013 17:12:11 +0100
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From: Thomas Gleixner <tglx@linutronix.de>
SYSTEM_RUNNING might be too late for enabling interrupts. Allocations
with GFP_WAIT can happen before that. So use this as an indicator.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bigeasy@linutronix: fix !page conflict]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
mm/slub.c | 13 +++++--------
1 file changed, 5 insertions(+), 8 deletions(-)
Index: linux-3.2.35-rt53/mm/slub.c
===================================================================
@ linux-3.2.35-rt53/mm/slub.c:1288 @ static struct page *allocate_slab(struct
struct page *page;
struct kmem_cache_order_objects oo = s->oo;
gfp_t alloc_gfp;
+ bool enableirqs;
flags &= gfp_allowed_mask;
+ enableirqs = (flags & __GFP_WAIT) != 0;
#ifdef CONFIG_PREEMPT_RT_FULL
- if (system_state == SYSTEM_RUNNING)
-#else
- if (flags & __GFP_WAIT)
+ enableirqs |= system_state == SYSTEM_RUNNING;
#endif
+ if (enableirqs)
local_irq_enable();
flags |= s->allocflags;
@ linux-3.2.35-rt53/mm/slub.c:1320 @ static struct page *allocate_slab(struct
stat(s, ORDER_FALLBACK);
}
-#ifdef CONFIG_PREEMPT_RT_FULL
- if (system_state == SYSTEM_RUNNING)
-#else
- if (flags & __GFP_WAIT)
-#endif
+ if (enableirqs)
local_irq_disable();
if (!page)